hot 3way dimmer

Hi again!

Why is the new Lutron dimmer I installed in a new 15 amp lighting circuit of 9 cans getting so hot (temperature), where the fixture is controlled by two switches (one is the dimmer) and the power goes through the light. By the way, there is a slight hum when dimmed and all 9 cans have 60 watt halogen spots in them.

I admit that I wired the switches incorrectly at first. I understand how the current runs for 3 way, but not which terminal is which on the switch.

hot 3way dimmer

hot 3way dimmer

In my house, I have dimmers in most rooms (from the previous owner) and I only use them in the bedrooms to check on the kids at night. So I use CFL's in the other rooms where we spend more time and don't dim the lights much.